REDU format ruling
Parry

Nearest-era rulings (Tengu, Sept 2011) — no REDU-specific archive exists.
Card effect (current official text)Return 1 "Gladiator Beast" card from your hand to the Deck, and negate the activation and effect of a Trap Card, and destroy it.
Rulings
- The "Gladiator Beast" monster returned to the Deck is returned to the Deck when "Parry" is resolved. It is not a cost. You must show the "Gladiator Beast" to your opponent when resolving "Parry’s" effect.
- You cannot activate "Parry" if you do not have a "Gladiator Beast" monster in your hand.
Rulings data courtesy of Format Library — formatlibrary.com. Spotted an inaccuracy? Flag it in the REDU forum — sourced change requests get reviewed.